Unused keyword list, but needed for auto-completion

Indexer returns the following warning:

"data/syntax/swift.xml" line 111 unused keyword: "types"

I think this should return an error code and it's an oversight in the indexer.

The syntax of swift is based on : to determine the presence of a type and this list is indeed not necessary.

Unfortunately, removing this list means that there is no autocomplete for types in kate and other editors (at least for an empty file).

For this scenario, I propose to add a autocompleteOnly attribute which indicates that this behavior is normal and wanted:

<list name="types" autocompleteOnly="true">
  ...
</list>

What do you think ?